The Startup Way - The new book from Eric Ries, author of The Lean Startup
100 in 100 Challenge - Get 100 new paid users in 100 days
GrowthHackList - 100+ curated growth hacks for makers + early stage startups
UI Playbook - The documented collection of UI components
GrowthHackers Projects - Growth collaboration software for teams 📈
UserInterface.io - Weekly UI/UX tips in your inbox for free